The data for marks in Physics and History obtained by ten students are given below :

Marks in Physics
15
12
8
8
7
7
7
6
5
3
Marks in History
10
25
17
11
13
17
20
13
9
15
Using this data:
(i) Find the line of regression in which physics is taken as the independent variable.
(ii) A candidate had scored 10 marks in Physics but was absent from the History test.Estimate his probable score for the latter test.